Mosquito season in Hamilton County, FL: when it starts and ends

Mosquito months in Hamilton County

In a normal year mosquito season in Hamilton County, FL starts around February 22 and ends around December 7, about 41 weeks.

1. Jan
2. Feb
3. Mar
4. Apr
5. May
6. Jun
7. Jul
8. Aug
9. Sep
10. Oct
11. Nov
12. Dec

What to do in Hamilton County, and when

• Start tipping out standing water weekly by February 8.
• Book any yard treatment for late February, ahead of the July peak.
• Repellent can go away after December 7.
• No West Nile cases since 2016, so bites in Hamilton County are a nuisance; check window screens.

Hamilton County against the rest of FL

Hamilton County has the 62nd longest season of 67 FL counties, at 288 days against 365 in Broward County and 281 in Gilchrist County. Its mean temperature is 66.5°F.

• Lafayette County: February 17 to December 13 (299 days, 1 WNV)
• Washington County: February 16 to December 8 (295 days, 1 WNV)
• Wakulla County: February 26 to December 11 (288 days, 1 WNV)
• Gadsden County: February 28 to December 10 (285 days, 1 WNV)

West Nile in Hamilton County

CDC ArboNET lists no human West Nile cases for Hamilton County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 3 of those years.

See how the dates are worked out, and when mosquitoes go away for the winter.